The slave ship Mersey departed on a transatlantic slave-trading voyage that would carry enslaved Africans to Martinique.

Vessel: Mersey; flag: Great Britain; rig: Ship; estimated standardized tonnage: 212. People recorded in connection with the voyage: Captain: Johnson, Robert; Investor: Johnson, Robert; Captain: Molyneux, Thomas; Investor: Molyneux, Thomas. The voyage began at Liverpool on 21 May 1798. Principal recorded place where captives were acquired: West Central Africa and St Helena, port unspecified. Principal recorded disembarkation place: Martinique, place unspecified. Recorded outcome: Voyage completed as intended.